Projecting apparatus.



Patented July 29, i902.

No. 705,77I.

A. & L. LumnE.

PRUJECTING APPARATUS.

(Application led Oct. 25, 1901.)

2 Sheets-Sheet I` (No Ilodal.)

A 770/PNE 73.

(lo Model.)

Patented July Z9, |902. A. & L. LUMIERE.l

PRUJECTING APPARATUS.

(Application tiled Oct. 26, 1901.)

2 Sheets-Sheet 2.

lll VEN 4Tous, wlrufssfs.- I @www @Mad 5ba/:MAM @www BY Y TTOHNE YS mi Nonms PETERS co, PHoTo-Llmo.. WASHINGTON. D. c

UNITED STATES PATENT OFFICE.

AUGUSTE LUMIERE AND LoUIs LUMIERE, or LYoNs, FRANCE.

PROJ ECTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 705,771, dated July 29, 1902.

Application filed October 25, 1901. Serial No. 79,982. (No model.)

To all whom, t may concern:

Be it known that we, AUGUSTE LUMIERE and LOUIS LUMIERE, citizens of France, residing at Lyons, France, have invented certain new and useful Improvements in Projecting Apparatus, of which the following is a full, clear, and exact description, and for which we have made application for patent in France, dated May 1, 1901.

The invention has for its object an improved arrangement of the apparatus employed for the projection onto a cylindrical surface of panoramic images obtained by processes such as described in our application for patent filed March 20,1901, under Serial No. 52,077.

The improved apparatus is represented in the accompanying drawings, in which- Figure 1 is a vertical axialvsection; and Fig. 2 is a plan, partly drawn in section on the line 1 2 of Fig. l. The arrangement represented in Figs. 3, 4c, and 5 shows the principle which has been utilized. j

In Fig. 3, d is a cylindrical transparent film, lighted inside, bearing a panoramic picture which has to be projected upon a cylindrical screen s, having the same center p like the lm. We use to this purpose an objective which turns around the center p outside of the iilm and which we represent by its nodal point o. Point rc, placed above op, will be projected on the screen in /y on the extension of o p. lf now objective ois made to turn the little quantity o 0/, then the projection of pointez will be displaced on the screen and will be in y2. However, if a plane mirror m is placed in 0' the projection of point at can be brought back to y. The calculation shows that if the reflecting-surface of the mirror passes through axis p c of the objective and if there exists at the same time the proportion T-z gli-! ray 0' will be relong as are a: @c2 is small enough to be conh founded with its chord-that is to say,withiu limits which will sufliee for practical purposes.

lf we consider now in Fig. lseveral points 0c a," @c2 of the picture which has to be projected and mirror m connected with the objective, we iind that in the position o of the objective point Qc is projected directly in y. lVhen the objective has arrived in o', point is projected directly in y', while point @c continues to be projected in y by reflexion on m@ Vhen the objective has arrived in o2, point :r2 is projected directly in y2, while points 41;' :c continue to be projected in fg g/ by reflexion on m2. The projection of surface no' 002 of the picture has heretofore re mained fixed on the screen while the objective has traveled from o to 02. lf the objective continues its movement, the successive surfaces x2 :nl of the picture will be projected in the saine manner on the screen y2 p3 g3 y?, and after a complete revolution of the objective the entire surface of the picture will have been projected on the screen by successive parts in their natural order. lf the objective turns fast enough, so that every part of the projection remains on tho retina during one complete revolution, then the entire projection will be visible in a continuous manner upon the screen, where it remains fixed.

Mirror m in Fig. 3, which passes through the nodal point of the objective, cannot be easily applied, and we have only shown itin order to simplify the demonstration. For practical purposes we use a mirror at fortyiive degrees, m in Fig. 5, placed on the passage of the projected rays between picture CV and objective o. Said mirror produces exactly the same effect like the mirror in Fig. 1. The straight ray p g, Fig. 3, is replaced by the broken ray p m -1- m y and ray o c by o m -lfm Consequently it will be necessary to obtain 1%] m i m y 2 x jp o; 0 m -lon a; ln order that the objective turning-around picture a may not attain a too high speed, there may be arranged around said picture a certain number of obj ectives-for example, twelve, as shown in Figs. 1 and 2. Each objective c, provided with its redressing-mirror m, will yield on the screen a fixed projection of the picture, so that it will. be possible to IOO cause these projections to succeed at the same speed with a speed of rotation being twelve times smaller.

The apparatus is mounted around a fixed vertical axle d, on which is keyed a plate b. The film a, carrying the view to be projected, being held in a cylindrical form by metallic rings c c, is placed concentrically with the axle d upon the fixed plate b, on which it is centered by an annular iiange e.

Y The objectives o o, used for the projection, are fixed to a wheel f, revolving exteriorly of the film. Various numbers of objectives can be used, twelve being represented in the drawings. A correcting arrangement is adopted, consisting of a mirror inclined to a plane of forty-five degrees and placed between the objective g and the View to be projected. The objectives are therefore arranged tangentially to the wheel f, and the rays coming from the image traverse them after their reflection on the correcting-mirrors m fm.

The illumination of the iilm is obtained by a pencil n n of parallel luminous rays falling vertically to the center ot' the apparatus upon mirrors h h, inclined to forty-five degrees and carried by a pyramidal support j, which rotates at the same speed as the exterior wheel f. The mirrors h are rectangular and of equal number to that of the objectives, and each of them illuminates only the portion of the image which can be clearly projected by the corresponding objective. Condensers t' accompany each mirror and turn with them.

Drum f, carrying the objectives o and the mirrors m, is put in motion by any kind of motor and turns around the fixed film a. The lighting system, composed of mirrors 7L and of condenser-s fr, turns at the same speed Within said film, and in order to render said movements identical drum fand supportj are connected by lever k, passing above the ilma In order that the film may be exchanged, if this should be necessary, lever 7a is articulated on top of the support g and engages with its other end in a fork r, fastened to a suitable place of drum f. If the apparatus thus arranged is placed in the center of a cylindrical screen and the relations indicated aforesaid established between the rays of the cylinder-image and the cylinder-screen, on the one hand, and between the cooperating foci of the objectives, on the other hand, each point of the View will be projected on a fixed point of the screen by each of the objectives passing before this point-that is to say, with the arrangement shown in the drawings twelve times per rotation=a.nd each time duringa period equal to that of the illumination of the said pointthat is to say, during the passage before this point of one of the mirrors h. Therefore only a moderate speed is required to render the impression continuous.

What we claim as our present invention, and desire to secure by Letters Patent, is-

In an apparatus for the projection of panoramic photographic images, the combination of a plate b keyed on a fixed vertical axle and carrying the image to be projected, a wheelf capable of revolving around the said axle on the exterior of the image and carrying a plurality of objectives accompanied by their correcting-mirrors m, and an illuminating apparatus capableof revolving` in the interior of the lm at the same speed as the objectives and comprising, in front of each objective, a mirror h inclined at an angle of fortyiive degrees and a condenser t', substantially as herein set forth.

In testimony whereof We afiix our signatures in presence of two witnesses.

AUGUSTE LUMIERE. LOUIS LUMIERE. Witnesses:

Gastos r`nnUNrnUx hinein Vnonon., 

